This fancy ichneumonid wasp wandered a little on the window frame, a female Tromatobia lineatoria ^[1] (validation determination). A new garden species.

This species lays her eggs in spider egg sacks ^[2].

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Literature

¹ Nederlands Soortenregister

² Fitton, M. G., Shaw, M. R., & Gauld, I. D., 1988. Pimpline ichneumon-flies. Hymenoptera, Ichneumonidae (Pimplinae).